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TDC7200: Operation beyond absolute maximum ratings for short periods of time on the order of a few nanoseconds

Conor
Mastermind 9190 points
Part Number: TDC7200

Hi,

The clock input pin of the TDC7200 has increased undershoot and slightly exceeds the absolute maximum rating (-0.3V).

-0.3V is exceeded for a short period of a few ns, does this matter?

It affects the rise time, so if possible, I proceeded as is, but if it is not possible to exceed it for a short time, I will adjust the damping resistance.

Thanks,

Conor

  • 0
    TI__Mastermind 21280 points

    Hello Conor,

    Thanks for posting to the sensors forum! It depends, typically this should be okay since the abs max is only exceeded for a short  amount of time and if the undershoot does not exceed the abs max by a large margin. If it is a small undershoot that barely exceeds the abs max then you shouldn't be much of an issue since there is protection built into most devices to handle ESD events which tend to have a much large voltage and fast transients.

    Although, if you are still early in your development and have the ability to modify your design I would recommend that it would be best to add the protection for the device. The added protection will help ensure the longevity and proper operation of the part for years. While the device may still work past its specified abs max range we are not able to guarantee operation for long periods of times as you may be gradually breaking down the internal components.

    I hope this helps!

    Best,

    Isaac